After casting Oval Formation, do not cast the Dodge/Speed Increase skill for the ranged weapon for your clan
(Pegasus Feet for Jinong, Soaring Pheonix for Guanyin, Music of the Wind for Fujin), for they do not stack.
The personal buff negates this Formation buff, negating any benefit you gained from having this cast on you.

Slaughter Formation-
Formation that puts an emphasis on maximizing the destructive power of the brute force formation that can cause the
strongest blow to the captured enemy.

Initial Bonus: 210% Damage Applied

Initial Chi Cost: 311 Chi

Initial Attack Range Applied: 10 m

Initial Chance To Hit Applied: 100%

Max Level: 20

Max Bonus: 400% Damage Applied

Max Attack Range Applied: 10 m

Max Chance To Hit Applied: 100%

WARNING !

This is not a buff skill, it is an attack. Have everyone target an enemy then enter the formation.
Damage will be applied to the targeted enemy if you are in range.